/ Dictionary / Index P perianth: Meaning and Definition of Find definitions for: per•i•anth Pronunciation: (per'ē-anth"), [key] — n. Bot. the envelope of a flower, whether calyx or corolla or both. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: perianth (Thesaurus) Periander periapical Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language